Composition and method for fracturing subterranean reservoirs

a technology of subterranean reservoirs and composition methods, applied in fluid removal, chemistry apparatus and processes, borehole/well accessories, etc., can solve problems such as problems caused, oxidizing breakers are required, and inadequate enzyme breakers

Inactive Publication Date: 2007-01-25
BERGER PAUL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At temperatures above 120° F., the enzyme breakers are inadequate and oxidizing breakers are required.
However, problems caused by insufficient breaking or the breaking of the fluid too quickly are often experienced with the oxidizing breakers.
Heretofore, the control of breaking of the gel has been inadequate resulting in less than desirable treatment results.
The disadvantages of this approach are 1) the technique is expensive and 2) the melting and dissolving mechanism is dependent on the treatment and formation conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0024] The effectiveness of the partially esterified, polyalkoxylated polyols as oxidizing breaker retarders was determined for a crosslinked guar gum system. The crosslinked gel system contained 40 lbs per 1000 gallons of the guar gum, 10 lbs per 1000 gallons of the potassium carbonate and 1 lb per 1000 gallons of the borate crosslinking agent. 0.125 lbs per 1000 gallons of the Na2S2O8 was added to the crosslinked gel as the oxidizing breaker. Different amounts of the POE(30) sorbitol trioleate, which is sorbitol reacted with 30 moles of ethylene oxide and then esterified with 3 moles of oleic acid, were added as the oxidizing breaker retarder.

[0025] The samples were set in a 140° F. oven and the viscosity was measured after 0.5, 1, 2, and 3 hours. The data in Table 1 indicates that the POE(30) Sorbitol Trioleate retards the gel breaking rate of the oxidizing breaker. Using the same oxidizing breaker concentration, the time required for the gel to break is increased by increasing ...

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Abstract

A method for fracturing subterranean reservoirs by including a partially esterified, polyalkoxylated polyols as an oxidizing breaker retarder in the aqueous fracturing fluid to delay its gel breaking properties with the oxidizing breaker. The delayed gel breaking properties will lead to the controlled breaking of the fracturing fluid that reduces or eliminates damage to the formation and facilitates well clean up.

Description

[0001] This patent is a divisional of U.S. patent application Ser. No. 10 / 818849 filed Apr. 6, 2004 and published as US Patent Application Publication 2005 / 0227874 on Oct. 13, 2005.FIELD OF INVENTION [0002] This invention relates to a fracturing fluid composition containing an oxidizing breaker retarder and a method for fracturing subterranean reservoirs using such fracturing fluid composition. BACKGROUND—DESCRIPTION OF PRIOR ART [0003] Hydraulic fracturing is a technique commonly utilized to stimulate the production of oil and gas from subterranean formations of low permeability. In carrying out such techniques, the fracturing fluid is introduced into the formation under hydraulic pressure to produce one or more fractures in the target formation. The fluid can include proppants that are deposited in the fractures so that when the pressure against the formation is relaxed, the proppants maintain the fracture in an open or propped condition. [0004] Upon completion of the treatment, i...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C09K8/60C09K8/68E21B43/00
CPCC09K2208/26C09K8/685
InventorBERGER, PAULBERGER, CHRISTIE HUIMIN
OwnerBERGER PAUL